UPDATE: After several frustrating weekends I think I have finally tamed the beast. Looks like the liquid-filled pressure gauge on the fuel log was no good, hence the pressure was WAY higher than the needle/seats could handle. New gauge, slowed the pump to 40% crank speed, and voila! instantly cured! Car is rock steady on the stop and comes off clean with no rich spike etc. etc. Lost a close double-breakout 3rd rd. Sat. in S/C but not the car's fault this time! Just a caveat - fuel pressure and float levels are critical! 8) JB